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Inventories
 3 Months Ended
Mar. 31, 2022
Inventories [Abstract]  
Inventories
3. Inventories

The components of inventories were:

 
March 31, 2022
    
December 31, 2021
  
   
(In thousands)
  
             
Raw materials and purchased component parts
  
$
7,456
    
$
6,479
  
Work-in-process
    
–
      
11
  
Finished goods
    
1,592
      
1,230
  
   
$
9,048
    
$
7,720